Liquid door-check.



No, 050,700, y Patented out. 2, |900.

' H. K. .lune-s.

LIQUID 000B CHEGK.

. Appximn med mr. s, 1900.1 {No.Model.) 2 Sheets-Sheet I.

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' Patented Dct.'2, |900. H. K. pones. LIQUID DUUR CHECK.

:Application filed Mar. S, 1900.|

(No Model.)

2 Sheets-Sheet 2.

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PATENT OFFICE.

CONNECTICUT, ASSIGNOR TO THE CONNECTICUT.

LIQUID DOOR-CHECK.

SPECIFICATION forming part of Letters Patent No. 658,780, dated October 2, 1900.

Application led March S, 1900. Serial No. 7,881- (No model.)

To a/ZZ whom it may con/cern,.-

Be it known that I, HORACE K. JONES, av citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented Certain new and useful improvements in Liquid Door-Checks, of which the following is a specification.

My invention relates to improvements in liquid door-checks; and the objects of my improvements are simplicity and economy in lconstruction and efficiency and durability 1n use.

In the accompanying drawings, Figure 1 is a front elevation of my door-check. Fig. 2 is a plan view of the same with the springsleeve, the cap, the spring, and the inner bearing for the cam-shaft removed. Fig. 3 is a vertical section of my check on the line y of Figs. 1 and 2. Fig. 4 is a detached plan view of the piston and its cam-roller. Fig. 5 is a sectional view of the same on the line m :v of Fig. 3. Fig. 6 is a developed view of the edge face of the cam.

The case is composed of three partsthe cylinder or piston-chamber A, cam-chamber B, and spring-chamber C. The exterior of the spring-chamber C is provided on its back side with brackets or wings 7 for use in securing the check in place. In the bottom of the spring-chamber I secure the inner bearing 8 for the cam-shaft 9, the said bearing being in the form of adisk screwed into the bottom of its spring-chamber and having the hub or central portion extending up into the spring-chamber above the lower edge of the spring 10 and down into the cam-chamber below the extreme top edge of the'cam 11 on the cam-shaft 9. The upper end of the spring-chamber C is closed by the ordinary cap 13, and in the center of the` said cap the ordinaryspring-sleeve is iitted. The outer end of the cam-shaft is squared, as 14, or otherwise fitted to receive an ordinary crankarm or lever. (Not shown.) The inner end of the spring may be secured to the springsleeve in any ordinaryy manner, and the outer end of the said spring may be provided with ya hook for being securedto the case at the slot 15, Fig. 2. 1

The cylinder A, cam-chalnber B,and springchamber. C have, in the main, a cylindrical exterior; but they-are eccentrically arranged, so that the Vback side of the said three parts is substantially one straight wall, as shown in Fig. 3. I prefer to form the body or cylindrical portion of the piston 12 hollow and pivot a lever or clapper valve 16 to the lugs 17 within the hollow portion thereof; but the particular form of valve for closing and opening the port 18 through the piston is not essential to my invention. At the top of or above the cylindrical body of the piston there is a transverse pin or axle 19, that crosses the axis of the piston, and on the saidl axle 19 I place the conical roller 20'for acting in connection with the under face of the cam 11, the said roller being thus centered vin the piston, so that the pressure of the cam thereon is exerted squarely in the axial line of the pistonl and has no tendency to cramp or bind the piston in the cylinder. One side of the piston is 'extended upwardly above the said roller and provided with an overhanging projection 2l, having a conoidalA face for acting in connection with the upper face of the cam 11, or, in other words, for acting on the cam in opposition to the conical roll 20. This portion of the piston necessarily extends into the camchamber B. In theinner wallof the said camchamber I form the two vertical slots or ways 22, and the piston at its upper end is provided with two lugs 23, that are fitted to the said slots or ways, whereby the piston is held against rotation. The cam 11 is in the nature of a screw or web cam-that is, one half of it resembles a portion of a right-hand screwthread and the other half a portion of a lefthand screw-thread, excepting that the angle of inclination thereof is not uniform. One half of the cam shows in Fig. 3, while a developed view of its edgeis shown in Fig. 6.

The parts thus far described may be used without any means to regulate the leakage or iow of the liquid in the forward-that is,"

downward-movement of-the piston or in connection with ordinary devices for that purpose; but I prefer to employ the following novel construction:

The cylinder or piston-chamber A is formed of lcast-iron; but I make its walls rather thin- IOO will generally he desired-that is to say, itv

will permit the door to close sooner than is desirable.

ner wall7 a groove 24 and surround the cylinder at the said groove by a clamp 25. said clamp has a rabbeted inner face, with a part thereof fitted within the said groove, and I provide the said clamp with a tighteningscrew 26. The cylinder is grooved merely to assist in holding the clamp against dropping down outl of place when lossened, and the inner face of the clamp is rabbeted, so that the said clamp may be placed closelyA up against the lower end of the cam-chamber B and at the same time so that it will exert its pressure on the cylinder at a point below the said lower end of the cam-chamber. It will be seen by au examination of Fig. 3 that the upper part of the clamp does not press upon the cylinder and that all the pressure of the clamp is concentrated on the grooved portion of the cylinder.

As shown in the drawings, the piston is in its lowermost position, as it will be when the door is closed. Upon opening the door the camshaft will be partially rotated, and the cam, acting on the under face of the overhanging projection 21. of the piston l2, will force the piston upwardly, so that at a half of a revolution of the cam-shaft the piston will be at the extreme upper end of its stroke. In thus moving upwardly the valve 16 opens, and the iluid moves freely through the port in the piston, so as to offer little or no resistance to the said upward movement. Upon the return movement of the cam-shaft` and piston, as in closing the door, the valve closes and the fluid below the piston in the cylinder is confined and oers a resistance to said movement, so that the Apiston can move no faster than the Huid in some way escapes and flows to the upper side of the piston. This flow of the Huid to the upper side of the piston has heretofore been provided for in three different ways-by the leakage between the piston and cylinder without any provision whatever for regulating or controlling the said leakage, by providing a by-pass with a special valve to regulate the flow of the fluid, and by providing the piston-valve with an adjusting device, so as to provide for an adjustable leakage through the said valve when in its closed position. I depend on the leakage between the piston and cylinder; but instead of having the said leakage always the same I adjust it by compressing the cylinder itself, so as to regulate the tit of the piston thereto.

I form on the exterior of the cylinder, near the middle of the length of its in- The This I accomplish by means of the clamp 25, by screwing up of which I can contract the cylinder to makeI it lit the piston closely or loosely, as may be desired. By loosening the clamp the cylinder willexpand until it reaches its normal position. It should be observed that the circumference of the piston is so great that an infinitesimal contraction of the space between the said piston and cylinder will make adecided difference in the leakage, and therefore it is only necessary that the cylinder shall be compressible to a very limited degree. I have demonstrated by actual use that a cast-iron cylinder with its wall made materially thinner than the walls of such cylinders are ordinarily made is compressible to a sufficient degree to enable the cylinder to be contracted for adjusting the leakage between the cylinder and piston. While cast-iron is resilient when deflected, it is not necessary to my invention that the cylinder shall possess the inherent quality of springing back or expanding to its normal position when the clamp is loosened. The pressure of the liquid under the forward stroke of the piston will expand the cylinder when the clamp is loosened. In fact, with such a cast-iron cylinder as I use the cylinder at the middle of its length would be expanded beyond its normal diameter were it not held against such expansion by the clamp. By this means I can make a very fine adjustment, so as to regulate the leakage to any de' sired degree, and I do it by the most simple and inexpensive means. The construction is of the most durable character, not likely to get out of order, and involves no small passages that are liable to become clogged. I also wholly avoid perforating any of the parts for the insertion of any adjusting device, as has always been done whenever the leakage of the piston in its forward stroke has been regulated.

It is apparent that some changes from the specific construction herein disclosed may be made, and therefore I do not wish to be understood as limiting myself to the precise form of construction shown and described, but desire the liberty to make such changes in working my invention as may fairly come within the spirit and scope of the same.

I claim as my inventionl. In a door-check, the combination of a cylinder, With a piston loosely fitted therein and means for compressing the said cylinder for adjusting the fit of the piston therein, substantially as described.

2. In a door-check, the combination of the cylinder, the piston within the said cylinder and a clamp surrounding the said cylinder and arranged to exert its pressure on the body of the cylinder remote from its ends, substantially as described.

3. In a door-check, the combination of the, cylinder having a peripheral groove, the pis- IOO ton Within the said cylinder and a clamp surrounding the said cylinder at the said groove, With a portion of its inner face fitted therein, substantially as described.

4. In a door-check, the combination of the cylinder, with a piston fitted Within the said cylinder and means for adjusting the Wall of the said cylinder to regulate the leakage between the said Wall and the periphery of the said piston1 substantially as described.

HORACE K. JONES. Witnesses:

J AMES SHEPARD, B. C. WooDFoRD. 

